The distribution mode of arc current density determines the distribution modes of both arc heat flux and arc pressure, which are the basis to understand the physical nature of welding arc and to establish the mathematical model of welding processes.

We prepared Y_2O_3:Ho/Yb nano-particles by a solution combustion procedure and Gd_2O_3:Er/Yb nanowires as well as nanoslices by a hydrothermal method. The thesis was carried out with the purpose of exploring the luminescent characterization of nano-materials codoped with rare earth ions and finding the physical nature.

The different influences of the insulation grain boundaries and the junction barnes on the C-V charaeteristics were indicated and the physical nature of the C-V and T-V correlation was analysed.

With the Kuperus-Raadu model to describe the interaction between a prominence bud the background magnetic field, and Lundquist field to describe the distribution of current and magnetic field inside the prominence, the observational data of eruptive prominence on August 18, 1980 is systametically analysed and the physical nature in its eruptive process is discussed. The results show: (1) the physical cause of prominence to erupt is the kink-instabity of Lundquist field;

The physical nature of the reaction is revealed by analysing the intramolecular charge transfer as the tautomeric reaction is occurring. The activation barrier of the forward reaction is 168.87kJ mol~(-1), while it is 135.02 kJ mol~(-1) for the backward reaction.

Moreover,it illustrates the physical nature of two basic ways of improving vacuum degree through working out the relationship between thermodynamics function:U(internal energy),S(entropy),F(Gibbs free energy) and work of escape when the perfect gas in vacuum adsorbs and desorbs.

Finally, a quantum correction model to threshold voltage is given, which reveals the physical nature of the influence of QME on the V th shift and gives consistent results with experiments.

Owing to the fact that the results from numerical simulations can usually guide us to explore physical nature hidden behind natural phenomena, and that it will take quite some time and big dollars to explore physical character by using experimental approaches directly, and still further some experiments could not be carried out at present because of poor experimental conditions.

When the mathematical model of the dispersion was obtained, we analysed some basic laws of the dispersion, represented the physical nature of these laws according to the spectral structure of the wind field and proved that the gust intensity σ_w and the scale of turbulence L are two important physical parameters upon which the dispersion depends.

TCSC physics model can really reflect the physical nature of a power transmission system, and meanwhile simulate all kinds of system operation condition.

Glass decoration is one of the growing area in screen printing industry in recent years. However the physical nature of glass makes it one of the most difficult substrates to print.

It is very important of both chemical and physical nature of fiber in dairy ration to stimulate its chewing activity and to remain the stable milk fat percentage.

In order to study the physical nature of Explosive Magnetic Flux Compression Generator(EMFCG) of cylinder-taper configuration,a code MFCG(Ⅴ) was developed. A series of models have been calculated and analyzed by using this code.

Passing through appling continuously biological organic fertilizer 3 years, the results show that:The physical nature of soil gets certain improvement, the pH drops to 3.53-5.39%, soil B D. increases from0.37% to 4.97%;

Electronic structure of atom cluster Fe4B, taken as a tetrahedron, is calcu lated by using the self-consistent field Xα -scattered-wave method. The energy levels, contour maps and densities of states for the atom clusters Fe4 and Fe4B are analyzed and compared respectively, the effect of the B atoms on the electronic structure of atom cluster Fe4B is discussed, and some physical nature of amorphous alloy Fe80B20 is also discussed.

The key to the determination of Q value which reflects the physical nature and state of rock lies in the determination of coefficient α at which amplitude attenuates with the distance.

A Hypothesis of Possible Physical Nature of Signals of Intracellular and Intercellular Synchronization of Protein Synthesis Rhyt

A hypothesis of physical nature of signals for intracellular and intercellular synchronization of protein synthesis rhythms is considered.

Physical nature of the emergence of various regions in the aggregate structure was discussed.

The physical nature of boundary layer phenomena is explained, and an asymptotic solution is constructed for the self-similar problem with an arbitrary number of components in the system, by using the method of matched asymptotic forms.

The physical nature of these features associated with the disturbance of the function of distribution over vibrational energy due to the reaction is discussed.

The study of the induced flow in the vicinity of a lifting rotor in the forward flight is one of the fundamental but rather complicated problems in helicopter aerodynamics. In this paper an attempt is made to derive a practical formula for the induced velocity distribution in the lifting rotor disk plane on the basis of the generalized vortex theory. The distribution is approximated by a Fourier series to the second harmonics, and in order to facilitate integration process, two algebraic expressions are used...

The study of the induced flow in the vicinity of a lifting rotor in the forward flight is one of the fundamental but rather complicated problems in helicopter aerodynamics. In this paper an attempt is made to derive a practical formula for the induced velocity distribution in the lifting rotor disk plane on the basis of the generalized vortex theory. The distribution is approximated by a Fourier series to the second harmonics, and in order to facilitate integration process, two algebraic expressions are used to replace the complete elliptic integrals of the first and second kinds.To illustrate the physical nature of the induced velocity field a calculation is carried out for a typical distribution of the circulation, and the results for different azimuth positions are given in curves, which reflect the same general variation pattern as that of the experimental results.

In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation. This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion. Therefore it may be concluded that the motion of these scales also proceeds...

In the large-scale motion of the atmosphere there is a so-called geostrophic adaptation. This paper demonstrates that there is also a process of adaptation between the pressure and the wind field in the meso- and small-scale motion.From the scale analysis it is found that on the average in the equation of motion the term of the time derivative is one order of magnitude smaller than the main terms in the meso- and small-scale motion. Therefore it may be concluded that the motion of these scales also proceeds slowly under the condition of quasi-balanced forces just as that the large-scale motion proceeds quasi-geostrophically. If, however, in some way this quasi-balanced condition is disturbed, there must be a mechanism to bring the motion back to the quasi-balanced state. For the meso- and small-scale motion the inertia force (velocity advection), the coriolis force and the force of pressure gradient are in quasi-balanced state.The process to bring the motion to the state of quasi-balance of forces is called adaption process and the motion under quasi-balanced state is called quasi-steady process. The physical nature of these two processes is discussed in this paper. For meso-scale motion it is shown that in the adaption process D>>ζ, and in quasi-steady process D ≤ ζ, where D and ζ are respectively the divergence and the vorticity.If at certain time the quasi-balanced state is brokendown in certain limited region, further development of this motion may be calculated as an initial value problem. The computation concludes that in the initial short interval of time the meteorological elements undergo vigorous change leading to the reestablishment of the quasi-balanced state and then the motion goes into quasi-steady state.The equations of quasi-balanced condition for the meso- and small-scale motion may be written asThis suggests that for the motion of this scale P-field should be analyzed instead of height or pressure field.

In this paper, the random process theory is used to study the problem of the dispersion of rockets effected by the random wind in the exterior ballistics. When the mathematical model of the dispersion was obtained, we analysed some basic laws of the dispersion, represented the physical nature of these laws according to the spectral structure of the wind field and proved that the gust intensity σ_w and the scale of turbulence L are two important physical parameters upon which the dispersion depends....

In this paper, the random process theory is used to study the problem of the dispersion of rockets effected by the random wind in the exterior ballistics. When the mathematical model of the dispersion was obtained, we analysed some basic laws of the dispersion, represented the physical nature of these laws according to the spectral structure of the wind field and proved that the gust intensity σ_w and the scale of turbulence L are two important physical parameters upon which the dispersion depends.